A Switch-Mode Continuously Variable Transmission is the mechanical analog of a boost converter circuit. The system uses a high-speed clutch to transfer packets of energy from a flywheel to a torsion spring, which drives the output. This project focuses on the design of a torsion spring, which can deflect 180 deg., has a linear spring rate, and fits into a car transmission. It must also have low inertia, to ensure efficiency, and be back-drivable, for regenerative braking. Two unique designs were prototyped then tested using a simulated drive-train consisting of a flywheel input, an electromagnetic clutch, and a disc brake or flywheel. By comparing qualitative and quantitative characteristics of each, the group chose one design which was developed full-scale and tested.

• This report represents the work of one or more WPI undergraduate students submitted to the faculty as evidence of completion of a degree requirement. WPI routinely publishes these reports on its website without editorial or peer review.

Creator

• Rotier, Matthew Adrien
• Woodnorth, Scott R
• Collins, Michael Saverio

Contributors

• Hera, Adriana

Publisher

• Worcester Polytechnic Institute

Identifier

• E-project-042711-231644

Advisor

• Van de Ven, James D.

Year

• 2011

Date created

• 2011-04-27

Resource type

• Major Qualifying Project

Major

• Mechanical Engineering

Rights statement

• In Copyright